MWITHIN Keyword for Simple Effects (MANOVA: Repeated Measures command)

You can use MWITHIN on either the WSDESIGN or the DESIGN subcommand in a model with both between- and within-subjects factors to estimate simple effects for factors nested within factors of the opposite type.

Example

MANOVA WEIGHT1 WEIGHT2 BY TREAT(1,2)
 /WSFACTORS=WEIGHT(2)
 /DESIGN=MWITHIN TREAT(1) MWITHIN TREAT(2)
MANOVA WEIGHT1 WEIGHT2 BY TREAT(1,2)
 /WSFACTORS=WEIGHT(2)
 /WSDESIGN=MWITHIN WEIGHT(1) MWITHIN WEIGHT(2)
 /DESIGN.
  • The first DESIGN tests the simple effects of WEIGHT within each level of TREAT.
  • The second DESIGN tests the simple effects of TREAT within each level of WEIGHT.